Adding-machine.



J. G. VINCENT.

ADDING MACHINE.

APPLICATION FILED SEPT. 24, 1906.

Patented Nov. 12, 1912.

l3 SHEETS-SHEET 2.

J. G. VINCENT. ADDING MACHINE. APPLICATION FILED SEPT. 24, 1906.

Patented Nov. 12, 1912.

13 SHEETS-SHEET 3.

J. G. VINCENT. ADDING MACHINE.

APPLICATION FILED SEPT. 24, 1906.

- Patefited Nov. 12, 1912.

13 SHEETS-$31311 4.

J. G. VINCENT. ADDING MACHINE. urmo'mlon rum) P124, 1900.

Patented Nov. 12,1912.

13 8HBETS-SKEET 7.

M/ QQ J. G.,VINGENT.

ADDING MACHINE. APPLICATION nn' rm 32mm, 1900.

'Pa tnted Nov. 12,1912;

I3 SHEETS-SHEET 8.

J. G. VINCENT.

ADDING MAGHINE.

AVPPLIOATIONI'ILED SEPT. 24,1906. 7 1,043,882. v Patented Nov 12,1912.

l3 SHEETS-SHEET 9.

. g2 Z ZZ/ EJJCLS Mm m J. G, VINCENT ADDING MACHINE.

APPLICATION FILED SEPT.2'4, 1906.

Patented Nov. 12, 1912.

'13 SHEBTS'SHEET 10.

J. G. VINCENT;

' ADDING MACHINE.

APPLIOAT ION nun 832124, 1906.

PatentedNov. 12,1912.

13 SHEET8BHEET 11.

J. G, VINCENT. ADDING MACHINE APPL IGATIQN rum) SEPT. 24. 1506. v

J. G. VINCENT. ADDING MACHINE. APPLICATION FILED SEPT.24,1906.

1,043 882. Patented'NW IZ, 1912. 13 SHEETS-SHEET 13.

36902 10 654 321 0 08905404, 3690230 4040506 07 455 6 7 a 9 0 70809080 7, 369 Q3456 706543200 56 78 9 01 0 521 0032 1 0 5 67 a 9000 UNITED STATES PATENT OFFICE.

JESSE G. VINCENT, OF DETROIT, MICHIGAN, ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ADDING-MACHINE.

.added or accumulated items and to distinguish subtotals and grand totals from each other and from other printed items.

A further object of the invention is to provide a visual signal showing the condltion of the machine as to accumulation of items therein, which signal, having been set by clearing operation 2'. c. by the taking of a grand total to indicate that there is no accumulation in the machine, will not be affected by the setting up on the keyboard of an amount and the printing of such amount without accumulation thereof. It is of course well known that in various kinds of listing and tabulating work performed upon an adding machine occasion frequently arises for printing a designating number which forms no partof any computation which the machine is to work out.

The invention also aims to provide a new form of connections for controlling the taking of totals, such connections not being adjusted as heretofore by finger pressure but being arranged to shift automatically, as by spring pressure, so that only a light touch is necessary upon the key or other manipulating device or devices. A minor object in this same connection is to improve the form of manipulating means by employing slide keys in place of depressible keys, thereby making the keyboard somewhatmore compact and sightly.

In adding machines it is customary to employ what is termed a repeat .key by whose manipulation an amount-may be caused to remain set up indefinitely on the keyboard while the machine is operated as many times as desired. It is also customary to employ what is termed -an error-key, whereby wrongly depressed keys may be released without operating the machine. By the Specification of Letters Patent.

present invention it is proposed to provide for automatically latching the repeat key in effective position-and unlatching it by the use of the error-key. tioning of the repeat key is made possible without requiring more than its more thrust or displacement in a single direction, e., without requiring compound movement as e. 9., first depressing and then rocking such key which latter manner of manipulation has been heretofore practised. Furthermore the above mentioned new arrangement provides. for convenientrestoration of the repeat key-to normal without requiring an extra key for such purpose which would otherwise be necessary in View of the automatic latching of the repeat key.

In the well-known Burroughs type of adding machine, to which the present invention more particularly relates, the accumulator stands normally in operative relation to its actuating devices and in an itemizing operation the accumulator and its actuators first separate and the actuators take up posi-' tions determined by the amount keys depressed, after which in the continued operation of the machine the accumulator and its actuators are brought together again so that Patented Nov. 12, 1912. Application filed September 24, 1906. Serial No. 335,961.

Thus efiective posiv I in the restoration ofthe actuators to normal p the accumulation will be efiected.

In order to avoid the possibility of the accumulatorand its actuators not coming together soon enough it is proposed by the present invention to provide for this con-' nection taking place atthe end of the initial stroke of the prime mover of the machine, so that the operative relationship between the accumulator and actuators must of necessity exist before any return of the actuators toward normal can be started. In this connection provision is made for disabling the means for brlnglng together the accu-- mulator and actuators when an ltem or number set up on the keyboard is not to be added or accumulated. With the above enumerated and incidental objects in view the invention consists in certain novel features of construction and.

combinations of parts, the essential elements whereof are recited in the appended claims and a preferred form ,of embodiment of which is described in detail hereinafter and fully illustrated in the accompanying drawings forming part of this specification.

Of said drawings, Figure 1 represents a top plan view of an adding machine having the improvements of the present invent-ion, some parts being broken away to disclose others elow them; Fig. .2 represents in right side elevation the interior working parts of the machine at normal, the casing and cross shafts and rods appearing in section, as likewise the laterally shiftin paper carriage mechanism at the rear; Fig. 3 is asimilar view from the left. hand side of the machine; Fig. 4 represents some of the interior working arts of the machine in left side elevation illustrating their relative positions in adjustment for printing but not adding or accumulating an item at a time when the accumulator stands at zero and the prime mover is at the end of its initial stroke; Fig. 5 is a somewhat similar view but showing more of the working parts, and illustrating them relatively positioned as when the first of a series of added or accumulated items has been set up on the keyboard and the prime mover has reached the end of its initial stroke; Fig. 6 shows the same arts as illustrated in Fig. 5, but relativey positioned as when a following item to be accumulated has been set up on the keyboard and the rime mover is at the end of its initial strofie; Fig. 7 shows the same parts illustrated in Fig. 4 but relatively positioned as when an item not to be added has been set up on the keyboard and an accumulation is present in the machine the rime mover is at the end of its initial stro e; Fig. 8 is a view similar to Figs. 4 and 7 but showing less parts, this view illustrating the relative positioning of parts when a su otal adjustment has been made and the rime mover is at the end of its initial stro 'e; Fig. 9 is a similar view illustrating the relative ositioningof part-swhen a grand total ad ustment hasibee n made and the rime mover is at the end of its initial stro e, some parts shown in Fig. 8 being omitted and others not appearing in Fig. 8 being illustrated' Fig. 10 represents a right side elevation 0 interior working parts of the machine, many of which parts are beyond those illustrated.

in Figs. 4 to 8, this view showingthe relative position of parts when the grand total key as been touched and the prime mover is at the end of its initial stroke; Fig. 11 is a similar view showing relative positioning of parts when the subtotal key has been operated; Fig. 12 is a fragmentary top plan view showing devices immediately below the key: board of the machine; Fig. 13 represents in right side elevation certain parts which similarly appear in Fig. 2 but under it different adjustment; and Fig. tail of a certain lost motion device; and Fig. 15 shows an exam le of'work such as the machine is, adaptet to perform.

The invention is by preference illustrated 14 is a perspective de-- and described as applied to the well known Burroughs adding machine, whose construction and mode of operation can be ascertained by consulting the \Villiam S. Burroughs patents Nos. 504,963 and 505,078, issued Se )tember 12, 1893. The disclosure in this and other patents and the extensive use of the machine on the market makes it un-' necessary to enter into a detailed description here of all of its accustomed mechanism and the particular manner of performance of'its various familiar functions. Therefore onl such elements in this machine will be speci cally referred to as need to be considered for a thorough understandin of the constr'uction and mode of operation of the v arious improvements of the present invention.

The reference numeral 291 desi ates the usual rows of numbered keys the epression of which sets stops to limit the extent of movement of racks 610 carried at the forward end of levers 611 indepen dentl pivoted u n a cross shaft 600 and exten ing in rear t ereof to carry sets of numeral type 618".' In an operation of the machine type are presented to a roller platen 1798 and by suitable hammer mechanism such as described in said Patent #505,078 driven against an ink ribbon through which an imprint is made upon paper overlying said platen. The latter is suitably supported in a aterally' movable carriage, the details of which need not be describedexcept as to certain devices hereinafter pointed out which perform the function of preventing cooperation between the racks 610 and the register or accumulator when it is desired to rint an amount or number without adding it. Said accumulator comprises pinions 916 to mesh with said racks and number wheels or disks 990 com ounded respectively with said pinions: is accumulator is as usual carried in the upper part of a rocking frame 910 pivotally supported u n a cross rod 900 and extendin below t e same. A pitman 914 is sdap V to engage this frame alternately above'and below its pivot, said pit- -man taking the shape of a triangular frame Reciprocations-of the pitman are produced throng the medium of a three-armed lever 913 with which it is connected, forwardly and rearwardl extending arms of said 1ever having an 961' and 961 a a wipe pawl 821 operates. is pawl is mounted on the up r end of an arm 813 secured to a rock s aft 800 which is oscilinst which 300 to which it is customary to apply an of the machine is brought about by drawing said lever projects forward over the path while the racks drop during the drawing tlie,lo\ver half of this slot is of such longitud'inal extent as to cause sald stud j to act accumulator frame will be rocked rearward 1,043jse2 lated in each operation of the machine. Said rock shaft is connected in a well known 1 inanner with a. rock shaft 100 which is in turn connected'through a link 366 with a sector plate 311 secured to a suitable shaft operating crank handle 368. An operation forward this crank handle to the limit .nd then releasing it when springs operate 1n. a well known manner to return the parts to". normal. In an itemizing operation the accumulator is rocked out of engage tentwith. the rack 610 at the outset and remains so forward of the crank handle. Then when said handle is released the accun'iulator is drawn into mesh with the racks and the return of the latter to normal position releases the number wheels or disks of the accumulator.

. .'Q'Iie-.of$.-1the improvements of the present invention"provides for the accumulator being moved into mesh with the racks'at the end tit-the forward stroke of the handle instead of at the commencement of its rearward strokeand to this end a link 'J is co pied at its forward end to the stud 958 iiu. "stormed at its rear end with a slot winch embraces a stud j on the arm 813.

against the rear end of this portion of the slot as the arm nears the end of its rearward stroke which. corresponds with the forward stroke of the operating handle. Thus the and the accumulator brought into mesh with the racks at desired time. The upper half of said. slot is made suiiiciently longer than the lower half to provide for preventing such rearward rocking of the accumulator bylowering the'rear end of the link J so as to bring the stud j into this elongated por tion of the slot. This is done when an amount or number is to be printed but not added. This depression of the rear end of the link is accomplished in the present instance through the medium of a link I jointed at its lower end to the link J and at its upper end to the forwardly extending arm of a bell crank lever .C. This arm of of movement of a stud 821 on the wipe pawl 82]. so that when lowered it will operate to prevent effective engagement between. said pawlaand the stud 961, thus disabling this pawl as a means for rocking the accumulator into mesh with the racks. The means here shown for lowering said arm of the bell crank lever comprise a linka jointed to the depending arm of said lever and extending rearward through the back of the machine casing and there joined to the transversely disposed lever a (Fig. l) piv oted intermediate its ends upon a bracket on the casing. llhel laterally movable paper jgfOIll'lGtl at one end of the lever a. .The

movement of the paper carriage to a position where. printing is to be done without accumulation causes the rocking of said lever by the action of one of the roller studs 174% against said cam nose and this rocking of the lever draws rearwardly the link a j and consequently the depending ai of t e bell crank lever of course resulting in dig pression of the horizontal arm of the same!" The bell crank leveris normally held forward against a stop pin a by a spiral spring a connecting said stop pin with the linka It is custou-ary in the Burroughs machine to establish an adjustment for taking a total by depressing the forward end of the pitman 914. thus bringing the widened upper portion of the'triangular part thereof about the stud 958 and thereby preventing the ensuing forward thrust of the pitman from disengaging the accumulator and racks. At the same time the depending branch of the pitman is brought into cooperative relation with the lower stud 958 so that whenthe pitman is drawn rearwardly the accumulator will be disengaged from the racks and remain at Zero. This adjustment is usually brought about through pressure applied to a key at the left hand side of the keyboard. 1

The presentinvention provides for the adj ustment being brought about through the action of a. spring, the key. merely operating to trip a latch and permit the spring to work. The usual link 911 is coupled at its lower end to the pitman and at its upper. end to the forwardly extending arm of a bell crank lever .227 secured to a rock rod 200 extending thus tends to rock the bell' crank 227 and establish the adjustment for taking totals,

The rear end of the link 226 is :jc-intcd to the lower end of an arm 227 swinging from a cross rad 200* and abutting against a cross rod 801. under the stress of said spring 287.

rearwardly by a. spiral spring 287 which A latch lever 217 pivoted on the cross shaft 200 is formed at its rear end to engage a stud 253 on said arm 227 and thereby hold the same and its connections forward to pre serve the itemizing adjustment of parts against the stress of said spring 287. The total key 291 slides freely in suitable guides in the supporting plates of the keyoard and rests at its lower end upon a stud 261 of said latch lever. Thus by touchin thistotal key said latch lever may be rocked to disengage its rear end from the stud 253 against the stress of a spring 286 connecting the latch lever with the link 226. This does not, however, imn'iediately result in the adjustment of the parts for taking a total, for the reason that said link 226 has a depending arm 226 which normally abuts against a stud 8% on the oscillatory arm 813 as shown in Fig. 3. Therefore the machine must start to operate before the total adjustment is established. Of course as the said arm 813 moves rearwardly said depending arm 226 of the link 226* will follow up the stud'8t5 and the total adjustment will then be assumed and maintained during he machines operation.

In order to hold the latch lever displaced without requiring continued pressure of the total key a latch bar 214 is mounted to slide upon a cross rod 200 and engage a stud 250 on the latch lever. This latch bar is drawn rcarwardly by a spring 286 tending to enforce its locking engagement with said stud, but normally the stud bears against a portion of the latch bar below the stud-engaging notch thereof, as shown in Fig. 3. Immediately upon the rocking of the latch lever by the touch on the total key the latch bar springs rearwardly to hold the latch lever and prevent its re-engagemcnt with the stud 253. The rear end of the latch bar is slotted to engage a stud 214 on one of the side bars 219 of the usual Burroughs key detent displacing bail 219. This bail, as well understood by those familiar with the Burroughs construction is rocked forwardly at the conclusion of an operation to displace tie-tents 228 which hold the amount keys depressed. Through a slot and-pin connection with the latch bar 214 this rocking of the bail is availed of to thrust forward the latch bar and release the latch lever 217 at the conclusion of an operation of the machine when the stud 845 has restored the total connections to normal by moving forward the link arm 226. It is desirable to prevent any depression of the total key or displacement of the latch lever after the machine has started to operate and to this end said latch lever'is provided with a stud 252 having a short series of downwardly pointed teeth on "its rear side for engagement. with upwardly pointed teeth in the front edge of the upper arm 825 of a lever pivoted upon a cross shaft 1400 and having a rearwardly and downwardly extending arm 828 adapted to be engaged by the stud 845. Normally an engagement of said stud with said lever hol s the same against the tension of the spring 881 (Fig. 3) so that the toothed upper arm of the lever is held away from the stud 252 but immediately upon the removal of said stud.

clusion of the forward stroke of the o )erat' ing handle so as to prevent action oft le depending branch of the pitman 914 upon the stud 958, thus causing the accumulator to remain in mesh with the racks and to have its accumulation restored. By the present invention the adjustment of arts for taking a subtotal is brought a ut through manipulation of a separate key from that used when causing adjustment for the taking of a grand total. In the present instance this key takes the form of a slide piece 298 near the upper left hand corner of the keyboard adapted to be moved back and forth in a suitable slideway provided b a plate 297 secured upon the keyboard. his slide piece has a stud 298 projectin through a slot in the upper plate 213 of t e keyboard and rounded at its lower end to seat in a socket formed at. the upper end of a lever pivotally mounted upon the cross shaft 600. This lever has a stud 625 occupying an angular slide 217' in the latch lever 217. Normally the vertically extending portion of this slot is in line with the stu latter occupies the upper portion of the same so that the latch lever may be freely rocked by a touch upon the total key to roduco the result hereinbefore described an to lock .the subtotal key against operation by reason of the lower rtion of said vertical partof the slot assing into engagement with the stud as il ustrated in Fig. 10. However, the upper portion of this vertical part of the slot also forms the for-word oblique part of the slot. erefore, with parts in normal position, by ushing the subtotal slide piece 298 reorwusly the stud 625 is caused to act upon thoup this oblique part of the slot and place the latch lever, producing the some effect. as a touch u n the total key in releasing or unlatchmg the connections for dcprcssin the forward end of the it-man 914. This rearward movement of t e subtotal slide does more, however, for it is necessary to disable the means whereby in the rtion of the side of eroby disand the l taking of a grand total the accumulator is disengaged from the racks during the re whose lower extremity normally marks the rearward limit of travel of the wipe-pawl 821. The'nioyementof the lever produced by sliding the 'subtotalkey rearwarc ly causes thislower extremity of the depending arm of the lever to advance and take up a position where said wipe pawl will encounter t. The result is to tilt said wipe 'pawl forward and prevent its engagement with the stud 961 as shown in Fig. 11, so that when the arm 813 moves forward no rocking of-the three-armed lever 913 will take placeand consequently the accumulator will remain in mesh with the racks.

,ln Burroughs machines heretofore known a visual signal has been employed'to show the operator whether or not thereis an accumulation of amounts in the machine or in other words whether the machine is clear with the accumulator standing at zero. The similar signal devices shown in the present case per 36 constitute no part of the present invention but a description of them will be necessary as to certain novel character 'irinting devices operated in connection there with. TV ithin a casing 1214; at the lower left hand part of the keyboard is arranged a suitable plate showing through an opening in said casing and bearing the word Clear or other suitable designation and also an indicating characteristic to show the opposite condition of the machine, asfor example ,a bar of red. This plate is pivotally mounted and provided: with a depending crank arnr1215 connected by a llnk 1212 with the u pperv end' of an arm 1210 p voted mtermediat'e its ends upon the cross rod 1 100 The upper part of this arm is normally held ward against the stress of" a spring 1280 (Fig. 3) by a latch 1211 pivotally, mounted upon across rod 200 and normally depressed by a spring 1281. Detent bars or strips 21 1 which are moved'rearwardly by depression of amount keys in thewell-known manner have depending lips 2141. acting upon a cross rod 402" of a bail comprising side bars 41.241 and 424- pivotally mounted upon a cross rod 400; The said bar 4.24: has a stud 1211 to act .upon a cam edge of the latch 1211 so.as to lift the latter whenever an amoul'it key is-depressed. This is for the purpose-of releasing the arm 1210 so that it i'i'iay shift the signal and display the redport-ion thereofindicative of the upon the depressio'naof an amount key when the firstol a series of ltems is setup on the keyboard, foi". ;ai(l-arm is further restrained by the abutment ofa stud 1250 thereolagainst the end of an 'arm 1216 on a rock forshaft 901. p This arm is formed with a hub portion having a semi-circular clutch men1- ber 1216 as shown in Fig. 14 and there is secured to said rock shaft a collar 1216 with similar clutch member 1216 slightly less than semi-circular so as to provide for lost ,mot-lon between 1t and the clutch member 1216*. A spring 1281 holds these clutch members in contact on the forward side of the shaft but it will be seen that the arm 1216 may be held back against the stress of said spring while the shaft continues to turn to some extent. Said shaft carries an arm 918", see Fig. 2, which is adapted to be struck by a roller stud 339 on an upwardly extending arm 311 of the sector plate 311 at theend of the forward stroke of the operating handle. Thus rocking of the shaft 904 is produced in a direction to elevate the arm 1216 out of engagement with the stud 1250 whereupon the arm 1210 may rock to change the signal.

The restoration of the arm in the taking of a grand total is brought about through the rearward movement of the pitlnantll-t when depressed. The pitman carries a piv-' oted abutment piece 1213 with a lateral lip engaging the forward edge of the link 911 to limit the action of a spring 983 which operates to maintain said abutment piece in position to act against the forwardly turned lower end ofthe arm 1210. During the accumulation of items and subsequent to the putting in of the first item the arm 1216 rests ontop of the stud 1250 and when the rock shaft 004returns to normal as the stud 339 leaves the arm 018 the spring 12S]. yields. Upon the shifting of the arm 1210 by the abutment piece 1212-3 this stop arm 1216 resumes its normal position in front of the stud 1250 andof course the latch 1211 drops over the stud 1250. During the itemizing subsequent to the putting in of the first item said latch 1210 sin'iply rests in rear of its shoulder upon said stud as shown in Fig. 6.

As heretofore stated it is one of the purposes of the present invention to provide for oldiracterizing different items and this is done by printing in association therewith certain special characters such, for example,

as a s1 :1 r to designatea total, the letter s to designate a subtotal, the letter c to designate thefirst of a series of accumulated items, and the number sign to indicate-an iumerumulated item. The devices whereby the setting of a type carrier to produeethe properimprint is brought about cooperate with the above described visual signal mechanism. The charm-tor type carrier is in the form of a bar 611. pivotally mounted upon 'the cross shaft 600 and hgld normally depressed as to its rear end by the engagement with its forward extension of a stud. 611 secured to said shaft 600 ylnch 1s a well known rock shaft of the Burroughs machine. A spring (311 secured to said forward extension of the type bar tends to elevate the rear end of the latter. At its rear end this bar carries type plates (318 having type to print the above mentioned characters but normally the bar is positioned with all of the type below the printing line. This bar lias a cam edge 611 similar to the cus tomary cam edge on the regular type lever 611 of a Burroughs adding machine and designed to operate in the same manner for disabling the hammer mechanism when the type bar is in normal position and permit an operation of such hammer mechanism as soon as the bar is moved from normal position and one or another of its type brought to the printing line. This bar is connected through the medium of a linli A with a crank arm A secured to a sleeve on the cross rod 200% said sleeve carrying a segment B having three steps or shoulders B B, B The said segment is guided between suitable plates B slotted as shown at (Z' c f for the guidance of pins d, c, f respectively, the latter designed to constitute stops for determining the extent of move ment of the segment by the abutment of the steps of the latter against said pins respectively. The stop pin d is carried by a bar D, which is jointed to an arm of the bell crank lever C and hence is set in position whenever a number is to be printed but not accumulated. The stop pin 6 is formed by the bent end of a rod or wire 6 which is co nected with an arm E compounded with the subtotal lever 625 and hence this stop pin moves into effective position whenever the subtotal key is operated. The stop pin f is formed by the bent end of a rod or wire f which is connected with the depending arm of the bell crank lever 227 and consequently takes up its effective position whenever the grand total key is depressed. This latter stop will of course be moved into effective position also when the subtotal key is depressed, bu the step 13 of the segment reaches the stop pin a before the step B can reach the stop pin f. The abutment of the stepped segment against one or another of the above described stop pins results in positioning the type bar (311" for printing either the subtotal, grand total or unaccumulated item characters. The position of said type bar for printing the first of a series of accumulated items is brought about by the abutment of the step B against a fixed stud F supported between the guide plates B. For maintaining the type har in normal posit-ion during the printing ofsuhsequent accumulated items a latch H is employed to engage said step B as enforced by a spiral spring H. This latch has a forward extending arm lying over a rearward. extension 227 of the bell crank lever 9.27

and the depending part of the latch carries In the case of a number being set up on the keyboard and the machine operated with the accumulator connections disabled, the latch is maintained out of position for engagement with the segment by reason of the fact that the oar'D is thrust across the rear end of the bar see Fig. 4. It will be noted that this also has the effect of preventing the signal arm from rocking and hence preserving the signal at the clear adjustment. In the case of the first item or amount to be added the rocking of the signal arm and theconsequent rearward movement of said bar G will permit the latch H to be moved rearwardly by its spring H, but prior to the rocking of the signal arm the segment B has moved rearward, carrying its said step coming against the fixed pin F. The forward upper edge of the segment is rounded off and the under rear edge of the latch is correspondingly rounded so that as the type bar is restored to normal at the conclusion of the machines operation the segment will push the latch forward against the stress of the latters spring and then the latch will snap under the step B assoon as the same passes the engaging shoulder of the latch. This condition then obtains during the accumulation of subsequent items. In the case of a number being printed without accumulation after one or more items or amounts have been accumulated and before any clearing operation, the latch will be displaced by reason of the bar D being thrust against the under side of the bar G and the resulting coaction of cam slot g and stud g as illustrated in Fig. 7, whereupon in the ensuing op'eration the type bar may rise to the proper position for printing the character indicating an unaccumulated item. In the case of a subtotal the latch is displaced by the action of the rearward extension 227 of the bell crank 227 against the tail of the latch, as' shown in Fig. 8. This also takes place when a grand total is to be printed and in such operation the signal arm is rocked as heretofore ex lained so that the bar G is drawn forwar and the latch further restrained by engagement of the rear end of the oblique slot g with the stud g.

It will beunderstood that in cveryoperir step B past the latch as shown in Fig. 5, 1

tion of the machine the studJtrll is swung back and forth so as to first free the special type bar and then restore'th'e same to normal position in case. it has been moved to any one of its printing positions.

Referring next, to the me s for latching the repeat key and releasing the same by the error key, the reference:numeral 291 designates the latter key which is mounted upon the upper end of a depending bar or stem 227 arranged to slidevertically through the keyboard plates. The lower end of this bar is bifurcated (see Fig. 2) to straddle a stud 258 on a forwardlyextending arm of the bail 219. A spring 281l'1olds this error key normally elevated and it will be obvious that the depression of said key against the stress of this spring will rock the bail 219 and release any depressed keys in the usual manner. The similar rocking of this bail which takes place automatically .at the conc'lusion of an operation of the machine is produced through the usual means comprising an arm 622 loosely mounterlehpon the shaft (300 and carrying a spring-drawn wipepawl ($23 to act against a roller on the bail 219, said arm being drawn downwardly by the same spring (381 which acts on said pawl and moved upwardly by the action against its depending portion of an arm 312 compounded with the sector 311. The machine is adjusted for repeating the addition of an item by disabling this arm 622. The means provided by the present invention for so doing comprise a latch lever 215 pivoted intermediate its length and formed at its lower end a hook to take under a stud 659 on said arm (322. The upper end of this lever is formed as a socket to receive the rounded end of a stud 298", said. stud being part of a slide key 298 fitted to a slotted guide plate 296 at the upper right hand part of the keyboard. A; spring 2846 is secured at one end to a forward projection of the lever 215" and at the opposite end to a latch arm 223 pivoted upon a cross rod. 207

of the bail 219. Normally a stud 263 of the lever 215 bears against the top of the latch lug 223" of said latch arm 223, the repeat key 298 being held in its forward position and the lower end of the lever 215 consequently in its rearward position by the spring 284*. Under these conditions the operations of the machine are not affected by the repeat devices. When it is desired to prepare the machine for repeating, the slide key 298 is pushed rearwardly and thus the lower hooked end of the lever 2l5 "brought forward into position for engagement. with the stud (552) (see Fig. 13). The stud 263 moves ofi' the top of the lug 223 arid the latch arm 223 springs up projecting said lug behind said stud and thus latching the repeat lever in its operative POSIUOD: ln this manner the repeat key is automatically held in operated position and requires no manipulation by the operator for such purpose. \Vhen the requisite number of repeat operations have been performed the depression of the error key 291 results in rest0r' ing the repeat key to normal position. To this end the error key stem 227 is provided with a stud 22% overlying the latch arm 223 so that when the error key is depressed this stud will displace said latch arm carrying its lu- 223 below the stud 263 whereupon the spring 28 1 returns the repeat lever and key to normal positions.

While the improvements of the present invention have been described as applied to the well-known Burroughs type of adding machine it is to be understood that the invention is notnccessarily limited to such particular application and that the form of means for carrying it-out maybe variously modified without departing from the spirit and'scope of the invention.

\Vhat is claimed is:

1. In a scribed. the combination of an accumulator, means for actuating the same, and item and total printing mechanism, means for preventing at will actuation of the accumulator. and means automatically operated for differently characterizing printed first items, unaccumulatcd items, totals and sub-totals.

' 2. In a machine of the character described. the combination of an accumulator, means for actuating the same, and item and total printing mechanism, means for preventing atwill actuation of the accumulator,

- means for denoting whether or not the accumulation is preserved after the printing of a total. and. automatically operated. means for differently characterizing printed first items, unaccumulated items, totals and subtotals.

3. In a machine of the character described. the combination of an accumulator; means for actuating the same, and item and total printing mechanism, a type-carrier with type for characterizing first items, unaccmnulated items, total amounts and subtotal amounts respectively, and means for variously positioning said carrier automatimachine of the character de.

cally to bring one or another of said type into position for printing according to the work the machine is performing at the time.

4. In a machine of the character described. the combination of an accumulator,

means for actuating the same, and item and total printing mechanism, means for pre- 

